Web-winding apparatus



Oct. 7, 1969 v v ALBERT 7 3,471,099

WEB-WINDING APPARATUS FIG.2

l HP w, u A 3 A A 12 H moron am m o 4 cuncA imes? 5 f" 1 1 I INVENTOR RICHARD JAMES ALBERT ATTORNEY United States Patent 3,471,099 WEB-WIN DING APPARATUS Richard James Albert, Clinton, Iowa, assignor to E. I. du Pont de Nemours and Company, Wilmington, Del., a corporation of Delaware 1 1 Filed Oct. 23, 1967, SenNo. 677,108 Int. Cl. B651: 77/00 US. Cl. 242-7551 3 Claims ABSTRACT OF THE DISCLOSURE The present invention relates to winding apparatus and, I

more particularly, is directed to improvements in and relating to web winding apparatus having an adjustable speed drive utilizing a magnetic clutch assembly and a control system associated therewith,

According to the present invention there is provided a web winding apparatus utilizing a drive system and a web winder, including means for effecting a programmed web speed increase from start-up to and not exceeding the rated web winder speed whereby the speed of the traveling web is increased to the maximum desired speed after the roll diameter of the winding web has attained a surface speed equal to the maximum speed of the drive system.

The nature and advantages of the invention will be more clearly understood by the following description, the appended claims, and the several views illustrated in the accompanying drawings wherein like reference characters refer to the same parts throughout the several views and in which:

FIGURE 1 is a schematic representation in perspective of the functioning parts of the salient portions of the winding apparatus together with the electrical control system; and

FIGURE 2 is a block diagram of the drive system of the apparatus of the present invention.

The apparatus herein disclosed in illustration of the invention includes a mandrel 16 axially driven by a suitable motor 17 through adjustable magnetic clutch 18 operatively connected between the motor'17 and mandrel 16. In operation, moving web material 11 is advanced toward roll 12 at a controlled speed by web advancing roller set 13 which includes a driven roll 14 and a non-driven roll 15 that rotates at the same speed as roll 14. Roll 14 is driven by a suitable motor 41 through adjustable magnetic clutch 38 operatively connected between motor 41 and roll 14. The speed of roll 14 is controlled by magnetic clutch 38, through controller 39, and feed-back from tachometer-generator 19. Power is delivered to magnetic clutch 38 upon actuation of relay 40 and start switch 37. Motor 41 operates at constant speed and is energized from the power line as depicted in-FIGURE 1 which is connected to a main power switch, not shown.

Roller set 13 is located ahead of mandrel 16 and advances web material 11 to mandrel 16 where it is wound. A tachometer-generator 19 is operatively connected to roll 14, and a tachometer-generator 20 is operatively connected to mandrel 16; each tachometer-generator generates an electrical signal and each such signal is fed through suitable electrical conductors to inverse speed "ice generator 21. Tachometer-generator 19 is characterized preferably by a voltage level proportional to the rotational speed of roll 14 and a direct current output adapted to charge a capacitor unit in the inverse speed generator 21; and tachometer-generator 20 is characterized by an alternating current output.

The inverse speed generator 21 receives the current output signal from each of tachometer-generators 19 and 20 and, in turn, itself provides a voltage output signal that is a function of the ratio of the rotational speed of roll 14 and mandrel 16. The inverse speed generator 21 is a conventional unit known to the trade such as, for example, Inverse Speed Board No. 45800345-0010 available from the Louis Allis Company, Milwaukee, Wis. The voltage output signal, commonly referred to as a control signal, from inverse speed generator 21 is fed through suitable electrical conductors to tension adjustor 32 which is a voltage divider adapted to select and transmit to clutch voltage controller 22 a portion of the control signal. The function of inverse speed board or generator 21 is to provide a control signal to clutch voltage controller 22 that is inversely proportional to the ratio of the angular speed of mandrel 16 to the angular speed of roller 14; as the radius of roll 12 increases, the speed of mandrel 16 decreases, and to maintain uniform web tension, the signal from inverse speed board 21 increases or becomes greater resulting in greater output from clutch voltage controller 22 to increase the torque of roll 12 accordingly. It is understood, of course, that as the diameter of roll 12 increases, the torque also must be increased in order to maintain uniform or constant tension on the web material. Thus, inverse speed board 21 provides a signal which accomplishes the purpose of increasing torque with web roll radius.

The clutch voltage controller 22 is a conventional unit known to the trade such as, for example, Voltage Controller No. 45500798-0000 available from the Louis Allis Company, Milwaukee, Wis. The clutch voltage controller 22 is electrically connected between the power source (not shown) and magnetic clutch 18 and controls in a continuous manner the line voltage or power fed to magnetic clutch 18 in direct response to the control signal received from tension adjustor 32 and thereby controls the torque characteristic of roll 12; i.e., magnetic clutch 18 controls the rotation of mandrel 16 and ensures that the torque of roll 12 is only that which is necessary to maintain uniform tension on the web material during the winding operation.

The change in torque requirement associated with acceleration and deceleration of roll 12 is controlled by acceleration-deceleration compensator 31. The acceleration-deceleration compensator 31 is a detector-amplifier electrically connected, as depicted in FIGURE 1, between tachometer-generator 19 and clutch voltage controller 22, and is adapted to detect and transmit to clutch voltage controller 22 a signal proportional to the rate of increase or decrease of the output signal of tachometer-generator 19. During normal winding operation, the accelerationdeceleration compensator 31, responsive to a constant voltage signal from tachometer-generator 19, transmits zero or no bias signal, but provides a signal of sufficient magnitude to clutch voltage controller 22 during acceleration or deceleration of roll 12 adequate either to increase or decrease the torque output from magnetic clutch 18 or roll 12 for maintaining the required degree of tension on the web material 11. The acceleration-deceleration compensator 31 is a conventional unit known to the trade such as, for example, Acceleration-Deceleration Controller No. 45500575-0000 available from the Louis Allis Company, Milwaukee, Wis. This element functions essentially by monitoring the magnitude of a capacitor therein charging or discharging current as the voltage that it senses changes with changing speed of the winding roll.

The foregoing describes the web winding apparatus in essentially its most rudimentary form, and the improvement provided by the present invention resides in appahand position and coupling into the system of inverse speed board 21.

The rising voltage from tachometer-generator 19 causes acceleration-deceleration compensator 31 to produce an output voltage which serves as a bias signal to ratus features depicted in FIGURE 1 adapted to linearly 5 controller 22 to provide for the additional torque required accelerate the web material 11 to an original web travelfor accelerating roll 12. The output of tachometer-gening speed, pause and maintain that speed until the winderator 19 and tachometer-generator 20 combine to pro ing web diameter is increased sufiiciently to provide a vide a control signal from inverse speed board 21 which surface speed equivalent to the desired higher web travelis transmitted to controller 22. ing speed, and then to accelerate the web traveling speed Voltage relay 42 is preferably provided with a suitable to the desired higher speed. dial calibrated to read directly the roll diameter of roll The web indi g apparatus f the present i entio is 12, and is preferably manually adjustable, whereby it may further characterized by a diameter-sensing potentiometer be preset at a selected roll diameter which is sufiicient 36 responsive to the position of lay-on roll 35 in relation to Provide the Peripheral Speed equivalent to the desired to roll 12 for selecting and transmitting a portion of the web traveling speed. Thus, voltage relay means 42 is in bias signal from DC. bias reference supply A. Lay-0n an open position at small diameters of roll 12. While the roll 35 is rotatably connected to the ends of levers L and voltage relay means 42 is open, resistance 45, large in L and the latter each are pivotally connected at P and comparison to the resistor in potentiometer 44, is full P, and lever arm L is provided at one end with adjustable across t pe e line accordingly, for a given p arm extension R that interconnects potentiometer 36 and Set Point 011 the potentiometer the control means 43 lay-on r011 35, As se f FIGURE 1, h layn u cannot provide a change in magnitude of the bias signal 35 t th t t f normal i di operations i urged t to the main drive speed controller 39. As long as resistwards mandrel 65 by fluid pressure or other suitable ance 45 is in series circuit, potentiometer 44 is ineffective means S and S, and the pivoted lever arm L between 25 to Provide a bias Signal to Controller 3 potentiometer 36 and lay-on roll 35 moves the adjustable AS the Winding r011 12 reaches th diameter correspondarm R to the maximum position, in relation to the resistor ing to the p Point on relay means the bias unit in potentiometer 36, to provide the appropriate bias Hal from potentiometer closes the Switch in Voltage signal to close switch in voltage relay means 42 which relay means 42 whereupon resistance 45 in t l means is connected to control means 43 comprising a potenti- 30 43 is shorted out of the circuit till-i5 Permitting P ometer 44 and a resistor 45. Control means 43 is con- Ometer 44 to transmit a bias signal of correspondingly nected to a suitable DC. voltage supply B and controller decreased magnitude to main drive Speed eolltieiier 39 39 and is adapted to provide an impulse signal which is for obtaining a corresponding increase in Web traveling transmitted to clutch voltage controller 39 upon enersPeed to the desired higher Web traveling which is easiiy gizing relay 40 by actuating start switch 37. As winding 5 and adlustabiy P y Petehtiemetef 44 in Control roll 12 increases in diameter, it causes lay-on roll to means mnve to the l ft i FIGURE 1 which, in turn, causes the The advantages of the present invention will be more pivoted lever arm L between potentiometer 36 and lay-on P Y appreciated y referring to the following iiiustfa roll 35 to vary the position of the adjustable arm R in tive examples in connection With FIGURE 2 in which relation to the resistor unit in poteniometer 36 and inthe Symbols represent! creases the magnitude of the bias signal to voltage relay Hpm=Horsepower of drive motor means 42, and the magnltude of the bias signal increases N D i motor speed ,rn and clutch input speed as the diameter or size of roll 12 increases. Magnetic Hpo=Horsepower of outshaft or clutch clutch 1 8 drives roll 12 through speed changer 47. N=C1utch output shaft speed (rpm) The bias voltage source or supply such as, for example, 45 HPw=HorSepower of Winder Spindle source A, etc., depicted in FIGURE 1, may be any of N =wi d indle speed (r.p.m.) those known to the art, and preferably is a stable and Ns=Nm -N or (inferential speed ad ustable D.C. source. For convenlence and clar1ty a Do=winder core diameter number of locations or sources are shown in FIGURE 1 but it is understood all may be connected to a common ILLUSTRATION 1 source. The power requirement for winding a web at constant A brief desel'lptloh 0f the OPeTatIOII 0f the Wllldlng tension may be determined from the equation: apparatus with reference to FIGURE 1 follows. When the main power switch (not shown) is energized, power is supplied to motors 17 and 41, and start switch 37 is open P K 2 N as is also normally open relay 46 and relay 40. 2

Upon closing switch 37 to set the apparatus in motion, relay 40 is closed which couples controller 39 to magnetic and assuming a motor speed, Nm, of 1800 r.p.m., an outclutch 38, thus energizing magnetic clutch 38 and placput speed of the magnetic clutch, N of 1600 r.p.m. and ing roller set 13 in operation to advance web 11 as well a web traveling speed of 1600 ft. per minute, then the as cause rotation of tachometer-generator 19. Closing power requirement for winding as the winding core di switch 37 also energizes start relay 46 which causes an ameter, D increases is listed in Table 1 below:

TABLE 1 Windin Diameter Nm NO Ns Nw HPQ 1+Ns/N HPm speed 1,800 1, 600 200 1, 600 It 1% We 1, 600 1,800 800 1, 000 800 1r 2% 2m 1, 600 1,800 400 1, 400 400 11 43 2 4%: 1, 600 1, 800 200 1, e00 200 1c 9 9a: 1, 600 1,800 100 1, 700 100 1x 18 182 1, 600

output from clutch voltage controller 22 to energize mag- ILLUSTRATION 2 netic clutch 18 and Start mandrel 16 rotating which, i Referring to Illustration No. 1, if it is desired to intum, causes tachometer-generator 20 to rotate and gencrease the web traveling speed 50%, i.e., from 1600 erate a voltage and cause shifting of relay 28 to the leftr.p.m. to 2400 r.p.m., then the power requirement for winding as the winding core diameter, D,,, increases is listed in Table 2 below:

means operatively connected to said speed control means adapted to generate a bias signal proportional to the pe- TABLE 2 Winding Diameter Nm N N3 Nw HPO 1+NS/No HPm speed Thus, it is seen from the above tabulation that by increasing the web speed 50%, it is necessary to install new drives, new higher horse power motors and to respeed the rewind spindles to achieve the desired increase. For

ripheral speed of said roll of web material for increasing the speed of said advancing web.

2. Winding apparatus comprising a rotatable member rotatably driven by a drive motor and an adjustable maginstance, at 16D the HPm from Table 2 is 50% greater netic clutch operatively connected therebetween; advancthan that listed in Table 1. ing means including an adjustable magnetic clutch adapted to advance a web of material to be wound into ILLUSTRATION 3 roll form on the rotatable member; control means oper- The power requirement to increase the web Winding atively connected to said advancing means adapted to speed 50% without respeeding the winder spindles, i.e., transmit motive power to the magnetic clutch thereof re- Nw and N do not exceed 1600 r.p.m., as the core disponsive to a control signal, adjustable first potentiometric amet er, D increases is listed in Table Bbelow. means adapted for generation of said control signal and It must be recognized that at a specific programmed for electrical connection between a DC. voltage source line speed increase, the time required from 0 ft./min. to and said control means, and second adjustable potentithe desired web speed should be at least the time required 5 ometric means adapted for electrical connection to a DC. for the roll diameter to exceed the diameter having a voltage source in combination with a guide member surface speed greater than the maximum speed of the adapted to contact the outer layer of web material on the winder drive. With Nw initially 1600 r.p.m., when 1 rotatable member and to vary the adjustment of said pm D is reached, the line speed is then reset to :2400 f.p.m., tentiometer as the roll of web material on the rotatable for at 1 /2 D the roll diameter would have a surface member increases in size for transmitting a bias signal speed potential equal to the maximum speed of the line to said first potentiometric means up to a pre-selected drive, when Nw is at 1600 r.p.m. value whereupon said first potentiometric means is en- TABLE 3 Windin Diameter Nm N Ns Nw HPO 1+Ns/No HPm speed P t15;::::::::: 1:383 1:233 383 1:333 1.5 5 5 5 1 11333 2D,, 1, see 1, 200 600 1, 200 1. 52: 11 2 2%: 2, 400 4D,, 1, 800 600 1, 200 600 1. 5: 3 41/1: 2, 400 8D,, 1, 800 300 1, 500 300 1. 52: e 91 2, 400 16Do 1, 800 150 1, 650 150 1. 5:: 12 1s: 2, 400 Thus, the winding speed may be increased without ergized for transmitting a bias signal to said control requiring new higher horse power motors, e.g., compare m a HPm to 1613 for Illustration Nos. 1, 2 and 3 -l8x, 27x, 45 Wmdmg apparatus q g to l m w r m 18x, respectively. said first and second potentlometric means are lnterconwhatis claimedis: nected by a switch adapted to be energized by the bias 1. Winding apparatus comprising a rotatable member Signal @0111 Sald seccjnd pftemiometriP means for driven by a drive motor; an adjustable magnetic clutch plmg sald first potentlomePnF duiecfly to operatively connected between said rotatable member and g Source for transmlttmg a blas slgnal to sald the drive motor; advancing means operatively connected 0 means to speed control means adapted to advance a web of ma- References Clted terial to be wound into roll form on the rotatable mem- UNITED STATES PATENTS ber; means adapted "tontransmit motive power to said 55 2,874,917 2/195'9 Pen 242 51 magnetic clutch responsive to a control signal, tension 3,061,223 10/1962 Andrade 242 7551 control means adapted to generate said control signal pro- 3,375,992 4/1968 Garske 242 75 51 portional to the ratioof the rotational speed of the advancing means and the rotatable member, and adjustable NATHAN L. MINTZ, Primary Examiner 

